Table 5 Peak stress and displacement distribution in 3D finite element models of reconstructed pelvises
Types of prostheses | Enneking resection type | Bilateral standing position | Affected foot (left) single-leg standing position | Healthy foot (right) single-leg standing position | Seated position | ||||
|---|---|---|---|---|---|---|---|---|---|
Location of highest stress /(Mpa) | Location of maximum displacement /(mm) | Location of highest stress /(Mpa) | Location of maximum displacement /(mm) | Location of highest stress /(Mpa) | Location of maximum displacement /(mm) | Location of highest stress /(Mpa) | Location of maximum displacement /(mm) | ||
– | Normal pelvis | Bilateral Arcuate line/12.11 | Upper part of the sacrum /0.84 | Upper part of the left acetabulum /46.73 | Right Anterior Superior Iliac Spine /3.43 | Upper part of the right acetabulum /45.33 | Left Anterior superior iliac spine/3.37 | Ischial tuberosity/13.67 | Upper part of the sacrum /1.05 |
3D-printed endoprosthesis | Type I + II | Bottom of the acetabular cup /62.92 | Upper part of the sacrum /0.85 | Bottom of the acetabular cup /303.6 | Right Anterior Superior Iliac Spine /3.75 | Iliac screw pathway /45.34 | Left Anterior superior iliac spine/3.43 | Iliac screw pathway /23.23 | Upper part of the sacrum /1.10 |
|  | Type II + III | Sacroiliac screw pathway /13.21 | Upper part of the sacrum /0.87 | Pubic symphysis plate /242.6 | Upper part of the sacrum /1.30 | Prosthesis-pubic bone contact area /109.2 | Upper part of the sacrum /1.47 | Bottom of the acetabular cup /26.71 | Upper part of the sacrum /0.98 |
|  | Type I + II + III | Sacroiliac screw pathway /80.71 | Upper part of the sacrum /0.33 | Bottom of the acetabular cup /158.0 | Right Anterior Superior Iliac Spine /0.58 | Prosthesis-pubic bone contact area /40.10 | Outer part of the acetabular cup /2.53 | Sacroiliac screw pathway /39.83 | Upper part of the sacrum /0.47 |
Modular endoprosthesis | Type I + II | CS internal fixator /299.7 | Upper part of the sacrum /0.71 | CS internal fixator/1074 | Right Anterior Superior Iliac Spine /2.57 | Pubic screw/383.8 | Left ischial tuberosity/3.02 | CS internal fixator/349.0 | Upper part of the sacrum /0.99 |
|  | Type II + III | CS internal fixator /182.1 | Upper part of the sacrum /0.87 | Pubic symphysis plate /1053 | Right Anterior Superior Iliac Spine /5.10 | Pubic symphysis plate /898.0 | Left Anterior superior iliac spine/3.19 | Pubic symphysis plate /1160.0 | Anterior superior iliac spine/4.03 |
|  | Type I + II + III | CS internal fixator /169.5 | Upper part of the sacrum /0.71 | CS internal fixator /781.5 | Right Anterior Superior Iliac Spine /2.37 | Pubic symphysis plate /411.5 | Outer part of the acetabular cup /2.74 | Pubic symphysis plate /565.1 | Anterior part of the ilium/3.84 |